15cljq045 is a 73.1 KB PDF that the index treats as a schematic, though its name matches the part-number format of International Rectifier or Vishay Schottky rectifiers. It should therefore be a datasheet covering ratings, pinout and mechanical outline for a lower-voltage member of the same family as 15cljq150. When replacing such a diode, check reverse voltage and current against the circuit. First confirm that the device marking on the board matches this document.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.